Translated from the Brazilian Portuguese expression: "Trofeu de rapariga".
Those single stem roses wrapped in plastic sold at bars, only bought by guys who want to impress girls but are running out of material, such as good conversation, jokes and dance moves.
Girl #1: "How was your date last night?"
Girl#2: " It was awful at the begenning of the night, but then he bought me a "Whore's trophy" so I splept with him.
Girl #1: " Wow, you earned that rose, whore!!"